package org.xawl.news.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringUtil {
	
	/**
	 * @Title: isNotEmpty
	 * @Description: 判断对象是否为空
	 * @param str
	 * @return: boolean
	 */
	public static boolean isNotEmpty(Object str) {
		boolean flag = true;
		if (str != null && !str.equals("")) {
			if (str.toString().length() > 0) {
				flag = true;
			}
		} else {
			flag = false;
		}
		return flag;
	}
	
	/**
	 * @Title: isEmpty
	 * @Description: 判断是否是空字符串 null和"" 都返回 true
	 * @param s
	 * @return: boolean
	 */
	public static boolean isEmpty(String s) {
		if (s != null && !s.equals("")) {
			return false;
		}
		return true;
	}
	
    /**
     * 下划线转驼峰法(默认小驼峰)
     *
     * @param line
     *            源字符串
     * @param smallCamel
     *            大小驼峰,是否为小驼峰(驼峰，第一个字符是大写还是小写)
     * @return 转换后的字符串
     */
    public static String underline2Camel(String line, boolean ... smallCamel) {
        if (line == null || "".equals(line)) {
            return "";
        }
        StringBuffer sb = new StringBuffer();
        Pattern pattern = Pattern.compile("([A-Za-z\\d]+)(_)?");
        Matcher matcher = pattern.matcher(line);
        //匹配正则表达式
        while (matcher.find()) {
            String word = matcher.group();
            //当是true 或则是空的情况
            if((smallCamel.length ==0 || smallCamel[0] ) && matcher.start()==0){
                sb.append(Character.toLowerCase(word.charAt(0)));
            }else{
                sb.append(Character.toUpperCase(word.charAt(0)));
            }

            int index = word.lastIndexOf('_');
            if (index > 0) {
                sb.append(word.substring(1, index).toLowerCase());
            } else {
                sb.append(word.substring(1).toLowerCase());
            }
        }
        return sb.toString();
    }

    /**
     * 驼峰法转下划线
     *
     * @param line
     *            源字符串
     * @return 转换后的字符串
     */
    public static String camel2Underline(String line) {
        if (line == null || "".equals(line)) {
            return "";
        }
        line = String.valueOf(line.charAt(0)).toUpperCase()
                .concat(line.substring(1));
        StringBuffer sb = new StringBuffer();
        Pattern pattern = Pattern.compile("[A-Z]([a-z\\d]+)?");
        Matcher matcher = pattern.matcher(line);
        while (matcher.find()) {
            String word = matcher.group();
            sb.append(word.toUpperCase());
            sb.append(matcher.end() == line.length() ? "" : "_");
        }
        return sb.toString();
    }

}
